If there was big(?) money flowing through the company regularly, Keeping the server at the office and the backup in the owner's house seems like a shoestring budget.
Which was way more common in the past years, esp in small companies when "IT" was to be cheap cheap, even if there was.
But it seems that the client in this story did not worry about cost. Want a new server? No problem, A second one (windows) no problem?
Was stuffing the box into a data center ever brought up?